标题： 在外尔半金属中光的巨大可调非互易性 显示英文标题

标题： Giant tunable nonreciprocity of light in Weyl semimetals

摘要： 光在Weyl半金属薄膜中的传播得到了分析。 这些材料的磁性家族通过异常霍尔效应而为人所知，由于大的贝里曲率增强，可以在没有外部磁场的情况下产生强旋光和非互易效应。 预测了在Voigt配置下，铁磁Weyl半金属薄膜中存在非互易波导电磁模式。 由于无能隙的Weyl谱和大的贝里曲率引起的强介电响应，铁磁Weyl半金属结合了磁性介质或半导体的最佳波导特性以及铁磁体中的强异常霍尔效应。 非互易性的大小既取决于内部Weyl半金属特性、Weyl节点的分离，也取决于外部因素，即薄膜周围介质之间的光学对比度。 通过调节Weyl半金属中的费米能级，可以在太赫兹和中红外范围内改变波导模式的工作频率。 我们的发现为设计紧凑、可调且有效的非互易光学元件铺平了道路。 显示英文摘要

摘要： The propagation of light in Weyl semimetal films is analyzed. The magnetic family of these materials is known by anomalous Hall effect, which, being enhanced by the large Berry curvature, allows one to create strong gyrotropic and nonreciprocity effects without external magnetic field. The existence of nonreciprocal waveguide electromagnetic modes in ferromagnetic Weyl semimetal films in the Voigt configuration is predicted. Thanks to the strong dielectric response caused by the gapless Weyl spectrum and the large Berry curvature, ferromagnetic Weyl semimetals combine the best waveguide properties of magnetic dielectrics or semiconductors with strong anomalous Hall effect in ferromagnets. The magnitude of the nonreciprocity depends both on the internal Weyl semimetal properties, the separation of Weyl nodes, and the external factor, the optical contrast between the media surrounding the film. By tuning the Fermi level in Weyl semimetals, one can vary the operation frequencies of the waveguide modes in THz and mid-IR ranges. Our findings pave the way to the design of compact, tunable, and effective nonreciprocal optical elements.